Calibration Strategies to Improve Exhaust Temperature Management in BSVI with Optimized Fuel Economy for 3.77 Lts Engine

For the upcoming norms of BSVI, it is very important to keep the balance of emission and fuel economy. In these paper different concepts for exhaust gas temperature management will be analyzed and compared. In transient and steady conditions with medium and low load, the effects of active control strategies on exhaust thermal management were studied at the test bench, which include E waste gate intake throttle valve opening, injection advance angle, injection pressure and post injection. The comparison study was factors impacting the fuel economy and temperature management along with to meet WHSC & WHTC emission. The DOE was done to understand the best suitable match with the above function to achieve the optimized fuel economy and BSVI legislative requirement. Different test where carried with 0-100% of opening of intake throttle valve, E waste full open and late post injection to understand the thermal management of engine in part and full load. The World Harmonized Transient Cycle (WHTC) was used to evaluate the effect of improving exhaust temperature. WHTC experimental results indicated clearly that the exhaust temperature was effectively increased within the whole 1800 s, especially in the idle and low load conditions. The assessment will focus on the effectiveness regarding the exhaust temperature increase and the related fuel economy penalty. Further factors such as robustness, effects operation strategy and required software functions and cost are discussed as well. The engine used in this study was an optimized in-line 4-cylinder research engine to achieve best combustion behaviour for lowest engine-out emissions and highest fuel efficiency. Results were described that using the intake throttle to controlling intake air can increase exhaust temperature obviously with the penalty of fuel economy. The impact of E waste and late post injection was elaborated in the test results with respect to emission results. The combination of DOE strategies for thermal management overall increase the exhaust temperature in both WHSC and WHTC cycle.